I have asked several people and cannot get a straight answer, but as a law enforcement officer, we are allowed to carry our own personal patrol rifles on duty at my agency. Several guys have SBRs and I am considering getting a new upper for mine. I work for an agency that is approximately 7 miles from the state line, which we have a lot of vehicle pursuits head towards. How would this work if any of us had SBRs with us and ended up in a pursuit across state lines? I understand that outside of a law enforcement capacity, that one cannot transport NFA items across state lines with the exception of suppressors without first notifying the ATF and getting the proper approval, but I cannot find anything anywhere that says anything about LE while on duty.